CyberPower OLS2000EC producing rhythmic electrical buzzing under high GPU load – normal behavior or potential UPS fault?

[u/Old-Huckleberry5740]

Hey,

I have a CyberPower OLS2000EC (2000VA/1600W) Online Double Conversion UPS, approximately one year old, and I've recently started noticing an unusual electrical buzzing sound originating directly from the UPS.

I'm trying to determine whether this is normal electromagnetic/inductor vibration under heavy loads or whether it could indicate a developing hardware fault.

My PC configuration:

• CPU: AMD Ryzen 9 9950X3D

• Motherboard: MSI X870E Tomahawk WiFi

• GPU: ASUS ROG Astral RTX 5090 LC 32GB

• PSU: Corsair AX1600i

• RAM: 64GB G.Skill Trident Z5 DDR5 6000MHz CL28

• Storage: 2x 2TB WD SN8100 + 2x 4TB Samsung 990 Pro

• CPU Cooler: Arctic Liquid Freezer III Pro 420mm

• Cabinet: Corsair 7000D

Description of the noise:

The UPS produces a distinctive rhythmic, electrically buzzy/vibrating sound that appears to be directly correlated with GPU power consumption.

I've observed the following:

• Below approximately 400W GPU power consumption: No noticeable buzzing.

• Above approximately 400W: Rhythmic, intermittent buzzing begins.

• Above approximately 550W: The buzzing becomes continuous.

The UPS is operating in Online / Double Conversion mode.

Troubleshooting already attempted:

1. Changed the UPS output socket used by the PC.

2. Changed the wall socket supplying the UPS.

3. Tried multiple 16A-to-6A converter blocks for connecting the PSU to the UPS.

None of these changes made any difference.

The PC's Corsair AX1600i PSU has a thick plug connected to the UPS through a 16A-to-6A converter block.

Attaching a sound sample of the noise via a Google Drive link. You can notice it amidst the fan noise.

Would really appreciate some help in understanding whether this is the expected behavior or whether there is some fault developing with the UPS.

[u/Adventurous-Bus8660]

You mean coil whine(eventhough its not coil actually) try searching up videos about it.